High-purity thermally and electrically conductive hydroxylated multi-walled carbon nanotubes; anti-corrosion and reinforcing hydroxylated carbon nanotubes

Product Details

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Partial application

Multi-walled carbon nanotubes are prepared by modified catalytic chemical vapor deposition (CCVD). They feature high conductivity, large specific surface area, high carbon phase purity, narrow outer diameter distribution, ultra-high aspect ratio, etc., with stable product quality.

Multi-walled carbon nanotubes are mainly used in related industries such as rubber, plastics, lithium batteries, and coatings. In the rubber industry, they are mainly applied to rubber products like tires and sealing rings, offering advantages such as high conductivity, high thermal conductivity, high wear resistance, and high tear resistance. In the plastic industry, adding a small amount can significantly improve electrical conductivity, thermal conductivity, and mechanical properties. They are mainly used in plastic products such as PP, PA, PC, PE, PS, ABS, unsaturated resins, and epoxy resins.

Actual parameters and detection indicators

Appearance: Black powder
Ignition residue: <3.00%
Loss on drying: <0.5%
Moisture content: <3.00%
Weight loss rate: >2.00%
Particle size: D90 <30μm

Carbon nanotubes are another allotrope of carbon discovered after C60. Their radial dimensions are small, with the outer diameter of the tube generally ranging from a few nanometers to several tens of nanometers, and the inner diameter of the tube is even smaller, some being only about 1nm. Their length is generally on the micrometer scale, and the ratio of length to diameter is very large, reaching 10³ to 10⁶. Therefore, carbon nanotubes are considered a typical one-dimensional nanomaterial. Since their discovery by humans, carbon nanotubes have been hailed as the material of the future and are one of the frontier fields in international science in recent years. Professor Alex Zettl from the University of California, Berkeley, believes that when comprehensively comparing C60 and carbon nanotubes in terms of application prospects, C60 can be summarized in one page, while carbon nanotubes require a whole book to be

Introduction
Multi-walled Carbon Nanotubes and Single-walled Carbon Nanotubes
In 1985, Professor Kroto, a spectroscopist from the University of Sussex in the UK, and Professors Smalley and Curl from Rice University in the US, during their collaborative research, discovered that carbon can form highly symmetric cage-structured molecules, C60 and C70, composed of 60 or 70 carbon atoms, which are called Buckyballs. In 1991, scientist Iijima from NEC in Japan, using a high-resolution tunneling electron microscope, first discovered a type of carbon nanotube in the cathode deposit formed during the production of C60. This nanotube has an outer diameter of 5-15 nm and an inner diameter of 2-13 nm, and is composed of only two coaxial graphite-like cylindrical layers stacked together. Subsequently, in 1993, Iijima's research group and Bethune's research group simultaneously reported the synthesis of single-walled carbon nanotubes with a very simple structure. This provided experimental possibilities for the theoretical prediction of the properties of carbon nanotubes, further expanded the range of carbon cluster materials, and greatly promoted theoretical and experimental research on carbon nanotubes, making this field a global research hotspot today [1].

Characteristics
The unique structure of carbon nanotubes determines that they possess many special physical and chemical properties. The C=C covalent bonds composing carbon nanotubes are the most stable chemical bonds in nature, thus endowing carbon nanotubes with extremely excellent mechanical properties. Theoretical calculations indicate that carbon nanotubes have extremely high strength and great toughness. Their theoretical Young's modulus is estimated to reach 5 TPa, with a strength approximately 100 times that of steel, while their weight density is only 1/6 of that of steel. Treacy et al. were the first to use TEM to measure the mean square amplitude of multi-walled carbon nanotubes in the temperature range from room temperature to 800 degrees, thereby deducing that the average Young's modulus of multi-walled carbon nanotubes is approximately 1.8 TPa. Salvetat et al. measured the Young's modulus of small-diameter single-walled carbon nanotubes and derived their shear modulus to be 1 TPa. Wong et al. used atomic force microscopy to measure the average bending strength of multi-walled carbon nanotubes as 14.2 ± 10.8 GPa, whereas the bending strength of carbon fibers is only 1 GPa. Both in terms of strength and toughness, carbon nanotubes are far superior to any other fibers and are regarded as the "super fibers" of the future.

Development Prospects
It is predicted that carbon nanotubes may become a new type of high-strength carbon fiber material, which not only has the inherent properties of carbon materials, but also the electrical and thermal conductivity of metal materials, the heat resistance and corrosion resistance of ceramic materials, the编织性 of textile fibers, and the light weight and easy processability of polymer materials. Using carbon nanotubes as a composite material reinforcement is expected to exhibit good strength, elasticity, fatigue resistance, and isotropy. It is anticipated that carbon nanotube-reinforced composites may bring about a leap in the performance of composite materials. Research on making composite materials with nanotubes first started on metal matrices, such as: Fe/carbon nanotubes, Al/carbon nanotubes, Ni/carbon nanotubes, Cu/carbon nanotubes, etc. The focus of research on carbon nanotube composites has shifted to polymer/carbon nanotube composites. For example, in lightweight and high-strength materials, where carbon fibers are used as reinforcing materials, the mechanical properties of carbon nanotubes, along with their small diameter and large aspect ratio, will bring better reinforcing effects.

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